Added blackboard element re-ordering

Author: alelievr

Assets/com.alelievr.NodeGraphProcessor/Editor/Views/ExposedParameterView.cs

@@ -18,6 +18,8 @@ public class ExposedParameterView : PinnedElementView
 
         readonly string exposedParameterViewStyle = "GraphProcessorStyles/ExposedParameterView";
 
+        List<Rect> blackboardLayouts = new List<Rect>();
+
         public ExposedParameterView()
         {
             var style = Resources.Load<StyleSheet>(exposedParameterViewStyle);
@@ -96,6 +98,11 @@ protected override void Initialize(BaseGraphView graphView)
 
             graphView.onExposedParameterListChanged += UpdateParameterList;
             graphView.initialized += UpdateParameterList;
+            Undo.undoRedoPerformed += UpdateParameterList;
+
+            RegisterCallback<DragUpdatedEvent>(OnDragUpdatedEvent);
+            RegisterCallback<DragPerformEvent>(OnDragPerformEvent);
+            RegisterCallback<MouseDownEvent>(OnMouseDownEvent, TrickleDown.TrickleDown);
 
             UpdateParameterList();
 
@@ -104,5 +111,85 @@ protected override void Initialize(BaseGraphView graphView)
                 text = "+"
             });
         }
+
+        void OnMouseDownEvent(MouseDownEvent evt)
+        {
+            blackboardLayouts = content.Children().Select(c => c.layout).ToList();
+        }
+
+        int GetInsertIndexFromMousePosition(Vector2 pos)
+        {
+            pos = content.WorldToLocal(pos);
+            // We only need to look for y axis;
+            float mousePos = pos.y;
+
+            if (mousePos < 0)
+                return 0;
+
+            int index = 0;
+            foreach (var layout in blackboardLayouts)
+            {
+                if (mousePos > layout.yMin && mousePos < layout.yMax)
+                    return index + 1;
+                index++;
+            }
+
+            return content.childCount;
+        }
+
+        void OnDragUpdatedEvent(DragUpdatedEvent evt)
+        {
+            DragAndDrop.visualMode = DragAndDropVisualMode.Move;
+            int newIndex = GetInsertIndexFromMousePosition(evt.mousePosition);
+
+            foreach (var obj in DragAndDrop.GetGenericData("DragSelection") as List<ISelectable>)
+            {
+                if (obj is ExposedParameterFieldView view)
+                {
+                    var blackBoardRow = view.parent.parent.parent.parent.parent.parent;
+                    int oldIndex = content.Children().ToList().FindIndex(c => c == blackBoardRow);
+                    // Try to find the blackboard row
+                    content.Remove(blackBoardRow);
+
+                    if (newIndex > oldIndex)
+                        newIndex--;
+
+                    content.Insert(newIndex, blackBoardRow);
+                }
+            }
+        }
+
+        void OnDragPerformEvent(DragPerformEvent evt)
+        {
+            bool updateList = false;
+
+            int newIndex = GetInsertIndexFromMousePosition(evt.mousePosition);
+            foreach (var obj in DragAndDrop.GetGenericData("DragSelection") as List<ISelectable>)
+            {
+                if (obj is ExposedParameterFieldView view)
+                {
+                    if (!updateList)
+                        graphView.RegisterCompleteObjectUndo("Moved parameters");
+
+                    int oldIndex = graphView.graph.exposedParameters.FindIndex(e => e == view.parameter);
+                    var parameter = graphView.graph.exposedParameters[oldIndex];
+                    graphView.graph.exposedParameters.RemoveAt(oldIndex);
+
+                    // Patch new index after the remove operation:
+                    if (newIndex > oldIndex)
+                        newIndex--;
+
+                    graphView.graph.exposedParameters.Insert(newIndex, parameter);
+
+                    updateList = true;
+                }
+            }
+
+            if (updateList)
+            {
+                evt.StopImmediatePropagation();
+                UpdateParameterList();
+            }
+        }
     }
 }

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this package will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [1.0.1]
+
+### Added
+- You can now re-order elements inside the blackboard.
+
 ## [1.0.0]
 
 ### Added